You are in the forests of Europe, 230 million years ago.

The air in the Late Triassic was thick with humidity, smells of dry sand and distant cycads. Walking along the sandy riverbanks, you stopped, frozen. A few meters away, moving slowly through the reeds, was a Stagonolepis.

It was about three meters long, looking like a cross between a crocodile and a tank, covered in thick, interlocking bony plates—its dorsal armor plating glistening in the sun. It moved clumsily, its heavy body dragging slightly, and its remarkably tiny head was browsing on the lush ferns near the water.

The small, upward-arched beak at the tip of its snout made a sharp, clipping sound as it fed. Realizing you were close to such a specialized browser—a slow-moving, heavily armored survivor in a world of emerging, faster predators—you stayed silent. It didn't seem to notice you, its focus solely on eating, fully confident in its protective armor.